Fundamental Gaussian mode content measurements on active large core CCC fibers

摘要

Applications in gravitational wave detectors [1] require high power lasers with approximately 200 W of single-frequency output in linearly polarized TEM00-mode. Single-frequency signals have been amplified to more than 500 W in master oscillator power amplifier (MOPA) configurations, employing photonic crystal fibers (PCF) [2] as well as chirally coupled core (CCC) fibers [3]. For a PCF amplifier system, a fundamental Gaussian mode power of 203 W was demonstrated in linear polarization [4]. In this contribution we report for the first time measurements of the overlap of high power CCC fiber amplifiers output beam with the TEM00-mode of a scanning non-confocal ring cavity [5].